228 citations · 552 across the 17 of their papers we have counts for
17 papers
IR-truncated symmetric model and its asymptotic spectral scaling graph
Uwe Guenther, Frank Stefani
The symmetric quantum mechanical model over the real line, , is infrared (IR) truncated and considered as Sturm-Liouville problem over a fin…
General PT-Symmetric Matrices
Jia-wen Deng, Uwe Guenther, Qing-hai Wang
Three ways of constructing a non-Hermitian matrix with possible all real eigenvalues are discussed. They are PT symmetry, pseudo-Hermiticity, and generalized PT symmetry. Parameter…
Time-dependent Hamiltonians with 100% evolution speed efficiency
Raam Uzdin, Uwe Guenther, Saar Rahav +1
The evolution speed in projective Hilbert space is considered for Hermitian Hamiltonians and for non-Hermitian (NH) ones. Based on the Hilbert-Schmidt norm and the spectral norm of…
A non-Hermitian symmetric Bose-Hubbard model: eigenvalue rings from unfolding higher-order exceptional points
E. M. Graefe, U. Guenther, H. J. Korsch +1
We study a non-Hermitian symmetric generalization of an -particle, two-mode Bose-Hubbard system, modeling for example a Bose-Einstein condensate in a double well potential…
The PT-symmetric brachistochrone problem, Lorentz boosts and non-unitary operator equivalence classes
Uwe Guenther, Boris F. Samsonov
The PT-symmetric (PTS) quantum brachistochrone problem is reanalyzed as quantum system consisting of a non-Hermitian PTS component and a purely Hermitian component simultaneously.…
The spherically symmetric alpha2-dynamo and some of its spectral peculiarities
Uwe Guenther, Oleg N. Kirillov, Boris F. Samsonov +1
A brief overview is given over recent results on the spectral properties of spherically symmetric MHD alpha2-dynamos. In particular, the spectra of sphere-confined fluid or plasma…